i used a old unbranded usb cable for my ipad mini 2 to the controller when i first bought my advanced and every now and again i would loose FPV for a split second, i then purchased a good brand Apple verified 1 foot cable from amazon which i have been using for the last 6 weeks and i have not had any problems at all with the FPV. so if you are having a few problems like i had get yourself a quality 1 foot lead..